CN110433847A - A kind of two dimension composite photo-catalyst h-BN/Ti3C2/TiO2And the preparation method and application thereof - Google Patents
A kind of two dimension composite photo-catalyst h-BN/Ti3C2/TiO2And the preparation method and application thereof Download PDFInfo
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- CN110433847A CN110433847A CN201910780215.2A CN201910780215A CN110433847A CN 110433847 A CN110433847 A CN 110433847A CN 201910780215 A CN201910780215 A CN 201910780215A CN 110433847 A CN110433847 A CN 110433847A
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- 229910009819 Ti3C2 Inorganic materials 0.000 title claims abstract description 49
- 239000002131 composite material Substances 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000011941 photocatalyst Substances 0.000 title claims abstract description 14
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000003054 catalyst Substances 0.000 claims abstract description 37
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 230000003197 catalytic effect Effects 0.000 claims abstract description 7
- 238000010276 construction Methods 0.000 claims abstract description 3
- 239000002245 particle Substances 0.000 claims abstract description 3
- SRBFZHDQGSBBOR-IOVATXLUSA-N D-xylopyranose Chemical compound O[C@@H]1COC(O)[C@H](O)[C@H]1O SRBFZHDQGSBBOR-IOVATXLUSA-N 0.000 claims description 24
- 239000010936 titanium Substances 0.000 claims description 17
- 238000007254 oxidation reaction Methods 0.000 claims description 14
- PYMYPHUHKUWMLA-UHFFFAOYSA-N arabinose Natural products OCC(O)C(O)C(O)C=O PYMYPHUHKUWMLA-UHFFFAOYSA-N 0.000 claims description 12
- SRBFZHDQGSBBOR-UHFFFAOYSA-N beta-D-Pyranose-Lyxose Natural products OC1COC(O)C(O)C1O SRBFZHDQGSBBOR-UHFFFAOYSA-N 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 10
- 239000006185 dispersion Substances 0.000 claims description 9
- 230000035484 reaction time Effects 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000002604 ultrasonography Methods 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 5
- 229910021641 deionized water Inorganic materials 0.000 claims description 5
- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 claims description 4
- 229910052724 xenon Inorganic materials 0.000 claims description 4
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 4
- 229910009818 Ti3AlC2 Inorganic materials 0.000 claims description 3
- 238000006555 catalytic reaction Methods 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000005530 etching Methods 0.000 claims description 2
- 238000004108 freeze drying Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000001027 hydrothermal synthesis Methods 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims 1
- 235000007164 Oryza sativa Nutrition 0.000 claims 1
- 235000009566 rice Nutrition 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 8
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 8
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 238000003786 synthesis reaction Methods 0.000 description 8
- 229920002488 Hemicellulose Polymers 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 235000019253 formic acid Nutrition 0.000 description 4
- 239000004310 lactic acid Substances 0.000 description 4
- 235000014655 lactic acid Nutrition 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000002028 Biomass Substances 0.000 description 3
- 238000007146 photocatalysis Methods 0.000 description 3
- 230000001699 photocatalysis Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 238000010189 synthetic method Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000004128 high performance liquid chromatography Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical compound FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- 150000003742 xyloses Chemical class 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/24—Nitrogen compounds
-
- B01J35/39—
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/16—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation
- C07C51/295—Preparation of carboxylic acids or their salts, halides or anhydrides by oxidation with inorganic bases, e.g. by alkali fusion
Abstract
The invention discloses a kind of two-dimentional composite photo-catalyst h-BN/Ti3C2/TiO2And the preparation method and application thereof.The catalyst is two-dimentional composite construction, and disc-shaped h-BN is supported on Ti3C2In nanometer sheet, and Ti3C2Aoxidize obtained TiO2Particle is located at disc-shaped h-BN and Ti3C2Among nanometer sheet.The preparation method of catalyst of the present invention is simple and efficient, reaction condition is easily controllable, and the catalyst has many advantages, such as that catalytic activity is high, thermal stability is good and can be recycled, and simply, has efficiently catalyzed and synthesized xylonic, is had a good application prospect.
Description
Technical field
The invention belongs to catalysis technical fields and xylonic field, and in particular to a kind of two dimension composite photo-catalyst h-BN/
Ti3C2/TiO2And the preparation method and application thereof.
Background technique
With the continuous development of world economy, demand of the mankind to energy resource increasingly increases, however traditional on the earth
The non-renewable resources such as petroleum, coal are increasingly depleted, and this requires people by some sustainable resources not being efficiently utilized
It makes effective use of, to alleviate the energy crisis of the earth.Biomass resource is renewable resource abundant on the earth, efficiently benefit
Have great importance with to alleviation global energy crisis.Hemicellulose has source as a kind of important biomass resource
Extensively, the advantages that rich reserves, but the utilization obstacle of hemicellulose allows of no optimist at present.In order to improve the high-valued of hemicellulose
It utilizes, people are usually translated into high value chemicals.Wherein, one kind that xylonic is converted into as hemicellulose is important
High value chemicals, in biology, medicine and the fields such as chemical industry by favor, by the NREL of U.S. Department of Energy subordinate
(National Renewable Energy Laboratory) and PNNL(Pacific Northwest National
Laboratory) be determined as jointly biomass refine most potential 30 kinds of target products or chemical industry basic building block unit it
One.Therefore, as a kind of widely used green bio base chemicals, xylonic is produced based on cheap, renewable resource xylose
Extremely attractive and development prospect is expected to a new outlet as the industrialization of hemicellulose biorefinery.
The synthetic method of xylonic is relatively fewer at present, some reported methods are such as urged even there are certain limitation
Cumbersome, severe reaction conditions of agent preparation process etc..Therefore, carry out a kind of new simple, efficient method synthesis xylonic tool
There is important meaning.Currently, photocatalysis technology nontoxic, safe and stable property is good, catalytic activity is high, quick, low energy consumption because of its,
The advantages that reusable, is widely used in the fields such as the degradation of carbon dioxide reduction, nitrogen reduction, photocatalytic water and organic matter.It will
The synthesis that photocatalysis technology is applied to xylonic will open up the approach of a brand-new synthesis xylonic.
Summary of the invention
The purpose of the present invention is to propose to a kind of two-dimentional composite photo-catalyst h-BN/Ti3C2/TiO2And preparation method thereof with answer
With.
The purpose of the present invention is realized at least through one of following technical scheme.
A kind of two dimension composite photo-catalyst h-BN/Ti3C2/TiO2, the catalyst is two-dimentional composite construction, disc-shaped h-
BN is supported on Ti3C2In nanometer sheet, and Ti3C2Aoxidize obtained TiO2Particle is located at disc-shaped h-BN and Ti3C2Among nanometer sheet.
Above-mentioned two dimension composite photo-catalyst h-BN/Ti3C2/TiO2Preparation method, comprising the following steps:
(1) by Ti3C2Ultrasound removing mixes with h-BN after freeze-drying, and deionized water is added, and ultrasonic disperse forms dispersion
Then liquid carries out hydro-thermal reaction；
(2) dispersion liquid after reaction is taken out, is filtered, washed and dried to get the two-dimentional composite catalyst h-BN/ is arrived
Ti3C2/TiO2。
Further, Ti in the step (1)3C2Mass ratio with h-BN is 1:3 ~ 3:1.
Further, in the step (1), titanium carbide is by etching corrosion Ti3AlC2It obtains, after ultrasound removing
Titanium carbide is few layer, and the layer before ultrasound removing is more, and surface area is small, if do not removed to titanium carbide ultrasound, later period exposure
TiO2 is few, poor catalyst activity.
Further, it is characterised in that: dispersion liquid concentration is 0.1 ~ 1 g/mL in the step (1).
Further, in the step (1) hydrothermal temperature be 160 ~ 200 DEG C, the time be 8 ~ for 24 hours.
Further, in the step (2), drying temperature is 60 ~ 120oC, time are 6 h or more.
The two dimension composite photo-catalyst h-BN/Ti3C2/TiO2Application in photochemical catalytic oxidation xylose synthesis xylonic.
Further, by xylose, two-dimentional composite photo-catalyst h-BN/Ti3C2/TiO2It is mixed with strong base solution, xenon lamp irradiation
Lower heating stirring carries out catalysis reaction.
Further, strong base solution concentration is 0.05 ~ 0.1 mol/L, and reaction temperature is 30 ~ 70oC, reaction time is
0.5 ~ 3 h, catalyst concn are 1 ~ 5 mg/mL, xylose concentration 1-20mg/mL.
Two dimension composite photo-catalyst h-BN/Ti of the present invention3C2/TiO2Preparation process is simple, efficient, in catalytic process
Catalyst used has many advantages, such as that thermal stability is good, catalytic activity is high and can be recycled, h-BN/Ti3C2/TiO2Photocatalysis
Aoxidizing xylose synthesis xylonic process has green, efficient, safety and low power consumption and other advantages.
The present invention is prepared for h-BN/Ti with a kind of simple hydro-thermal " one kettle way "3C2/TiO2Photochemical catalyst.Utilize Ti3C2's
Good conductive sub-feature shifts light induced electron, and the elecrtonegativity of h-BN shifts photohole, the incorgruous transfer of this electron hole
System greatly improves carrier utilization rate, with h-BN/Ti3C2/TiO2For photochemical catalyst, the catalyst h- under xenon lamp radiation situation
BN/Ti3C2/TiO2Upper generation activating oxide aoxidizes xylose under alkaline environment to prepare xylonic.
Synthetic method of the invention has the advantages that
(1) xylonic that the present invention synthesizes is a kind of high value chemicals, and a kind of important chemical intermediate；
(2) preparation process of catalyst of the invention is simple, reaction condition is easily controllable；
(3) catalyst of the invention prepares that raw material is relatively inexpensive to be easy to get, and is suitable for large-scale application；
(4) h-BN/Ti prepared by the present invention3C2/TiO2Catalyst is with thermal stability is good, catalytic activity is high, can be recycled
Advantage；
(5) method of the synthesis xylonic used in the present invention is green, safe and efficient, and low energy consumption;
It (6) is xylose in the presence of catalyst of the invention solves the problems, such as the xylonic synthesis process of part report at present
The synthesis of acid provides a brand-new approach.
Detailed description of the invention
Fig. 1 is h-BN/Ti prepared by embodiment 13C2/TiO2The scanning electron microscope (SEM) photograph of catalyst；
Fig. 2 is h-BN/Ti prepared by embodiment 13C/TiO2The transmission electron microscope picture of catalyst；
Fig. 3 is different catalysts dosage in embodiment 4-6 to h-BN/Ti3C2/TiO2Photocatalytic-oxidation is combined to xylonic yield shadow
Ring figure；
Fig. 4 is the differential responses time in embodiment 4 and 11-12 to h-BN/Ti3C2/TiO2Photocatalytic-oxidation is combined to xylonic yield
Influence diagram；
Fig. 5 is difference KOH concentration in embodiment 4 and 7-8 to h-BN/Ti3C2/TiO2Photocatalytic-oxidation is combined to xylonic yield shadow
Ring figure；
Fig. 6 is different temperatures in embodiment 4 and 9-10 to h-BN/Ti3C2/TiO2Photocatalytic-oxidation is combined to xylonic yield impact
Figure；
Fig. 7 is h-BN/Ti in embodiment 163C2/TiO2Photocatalytic-oxidation is combined to xylonic catalyst circulation using renderings.
Specific embodiment
Technical characterstic for a better understanding of the present invention is further described the present invention below by embodiment,
But the scope of protection of present invention is not limited to that.
Embodiment 1
(1) 1.0 g LiF powder are accurately weighed to be added in the hydrochloric acid solution of 30 mL, 9 mol/L, magneton are added, by the reaction
System is placed in water-bath, and keeping temperature is 0oC reacts 30 min in 500 r/min；Then weigh 1.0 g
Ti3AlC2It is slowly added into above-mentioned system, after the reaction was continued under the reaction conditions 60 min, adjusts water bath temperature to 35oC takes out reaction solution after reacting 24 h, appropriate amount of deionized water is added, and is centrifuged repeatedly repeatedly, removes supernatant liquor, obtains precipitating i.e.
For multilayer Ti3C2；
(2) it disperses product obtained in step (1) in deionized water, ultrasound 8 h of removing, then by the dispersion liquid cooling after removing
It is lyophilized dry, obtains few layer Ti3C2；
(3) few layer of Ti of 0.1 g step (2) acquisition is accurately weighed3C2It is placed in 0.1 g h-BN poly- containing 30 mL deionized waters
In tetrafluoroethene liner, 30 min of ultrasonic disperse formed dispersion liquid, after liner is sealed in reaction kettle, be heated to 180
DEG C heat preservation 8 h；
(4) dispersion liquid that step (3) obtains is placed in a large amount of deionized water, is filtered, washed, dries to get h-BN/ is arrived
Ti3C2/TiO2Catalyst.
Embodiment 2
By LiF and Ti in step (1)3AlC2Dosage is changed to 3.0 g, other are the same as embodiment 1；
Few layer Ti in step (3)3C2It is changed to 0.2 g with h-BN dosage, other are the same as embodiment 1；
Step (2), (4) are the same as embodiment 1.
Embodiment 3
Step (3) temperature is changed to 200oC, other are the same as embodiment 1；
Embodiment 4
Step (3) temperature is changed to 240oC, other are the same as embodiment 1；
Embodiment 5
Step (3) soaking time is changed to 16 h, other are the same as embodiment 1；
Embodiment 6
Step (3) soaking time is changed to 24 h, other are the same as embodiment 1；
Embodiment 7
(1) 100 mg xyloses, 30 mg h-BN/Ti are taken3C2/TiO2Photochemical catalyst, 0.08 mol/L KOH, 10 mL are in transparent resistance to
In pressure bottle (concentration of xylose is 10 mg/mL, and the concentration of catalyst is 3 mg/mL)；
(2) magneton, 5 min of ultrasonic disperse will be added in step (1) system；
(3) step (2) system is heated to 40 under xenon lamp irradiationoC reacts 2 h；
(4) filtrate for obtaining step (3) measures xylonic yield through high performance liquid chromatography method.
Embodiment 8
H-BN/Ti in step (1)3C2/TiO2Dosage is changed to 40 mg, other are the same as embodiment 7；
Step (2), step (3), step (4) are the same as embodiment 7.
Embodiment 9
H-BN@Ti in step (1)3C2@TiO2Dosage is changed to 50 mg, other are the same as embodiment 7；
Step (2), step (3), step (4) are the same as embodiment 7.
Embodiment 10
KOH concentration is changed to 0.09 mol/L in step (1), other are the same as embodiment 7；
Step (2), step (3), step (4) are the same as embodiment 7.
Embodiment 11
KOH concentration is changed to 1.0 mol/L in step (1), other are the same as embodiment 7；
Step (2), step (3), step (4) are the same as embodiment 7.
Embodiment 12
Temperature is changed to 30 in step (3)oC, other are the same as embodiment 7；
Step (1), step (2), step (4) are the same as embodiment 7.
Embodiment 13
Temperature is changed to 50 in step (3)oC, other are the same as embodiment 7；
Step (1), step (2), step (4) are the same as embodiment 7.
Embodiment 14
The reaction time is changed to 0.5 h in step (3), other are the same as embodiment 7；
Step (1), step (2), step (4) are the same as embodiment 7.
Embodiment 15
The reaction time is changed to 2 h in step (3), other are the same as embodiment 7；
Step (1), step (2), step (4) are the same as embodiment 7.
Embodiment 16
Step (1)-(4) are the same as embodiment 7；
(5) post catalyst reaction is recycled, continues to repeat above-mentioned experiment, which is repeated 10 times altogether, after each reaction
The step (4) repeated in embodiment 7 is tested.
Fig. 1 is two-dimentional photochemical catalyst h-BN/Ti prepared by embodiment 13C2/TiO2Scanning electron microscope spectrogram.From figure
It can be clearly seen that the catalyst is combined by three kinds of substances, wherein granular TiO2It is evenly distributed on Ti3C2Nanometer sheet
On, the h-BN of disc-shaped is distributed in the Ti after partial oxidation3C2In nanometer sheet.Tentatively illustrate that hydro-thermal rear catalyst forms a kind of layer
The compound pattern of shape, and Ti3C2It is partially oxidized into TiO2.Demonstrate two-dimentional photochemical catalyst h-BN/Ti3C2/TiO2Successful system
It is standby.
Fig. 2 is the two-dimentional photochemical catalyst h-BN/Ti of embodiment 13C2/TiO2Transmission electron microscope spectrogram.It can be clear from figure
Find out that the catalyst is two-dimensional structure clearly, disc-shaped h-BN is supported on Ti3C2In nanometer sheet, and Ti3C2What partial oxidation obtained
TiO2Positioned at h-BN and Ti3C2It is intermediate, it was demonstrated that lamellar composite photochemical catalyst h-BN/Ti3C2/TiO2Successful preparation.
Fig. 3 is catalyst amount different in embodiment 4-6 to h-BN/Ti3C2/TiO2Photocatalytic-oxidation is combined to xylonic
The influence diagram of yield.As can be seen from the figure with the increase of catalyst amount, the yield of xylonic increases therewith, in 30 mg
When reach highest, continue growing the dosage of catalyst, the yield of xylonic starts that reduced trend is presented.The study found that urging
When agent dosage is 30 mg, the yield highest of xylonic.In addition formic acid, lactic acid generate with this condition.
Fig. 4 is the differential responses time in embodiment 4 and 11-12 to h-BN/Ti3C2/TiO2Photocatalytic-oxidation is combined to xylonic
The influence diagram of yield.As can be seen from the figure as the reaction time increases, the yield of xylonic increases therewith, reaches in 2 h
Highest, the yield for continuing growing reaction time xylonic start that reduced trend is presented.The study found that be 2 h in the reaction time,
The yield highest of xylonic.In addition formic acid, lactic acid generate with this condition.
Fig. 5 is KOH concentration different in embodiment 4 and 7-8 to h-BN/Ti3C2/TiO2Photocatalytic-oxidation is combined to xylonic
The influence diagram of yield.As can be seen from the figure with the increase of KOH concentration, the yield of xylonic increases therewith, is in concentration
Reach highest when 0.08 mol/L, the yield for continuing growing KOH concentration xylonic starts that reduced trend is presented.The study found that
When KOH concentration is 0.08 mol/L, the yield highest of xylonic.In addition formic acid, lactic acid generate with this condition.
Fig. 6 is reaction temperature different in embodiment 4 and 9-10 to h-BN/Ti3C2/TiO2Photocatalytic-oxidation is combined to xylose
The influence diagram of sour yield.As can be seen from the figure as reaction temperature increases, the yield of xylonic increases therewith, at 40 DEG C
Reach highest, reduced trend occurs in the yield presentation for continuing to improve temperature xylonic.The study found that being 40 in reaction temperature
DEG C when, the yield highest of xylonic.In addition formic acid, lactic acid generate with this condition.
Fig. 7 is h-BN/Ti3C2/TiO2Photocatalytic-oxidation is combined to xylonic and effect picture is recycled.As can be seen from the figure
During being recycled 10 times, h-BN/Ti3C2/TiO2Catalytic effect be held essentially constant, illustrate that this catalyst has
Good recycling.
Above-described embodiment is part implementation process of the invention, but embodiments of the present invention are not by above-described embodiment
Limitation, others are any to be violated made change under spiritual essence and principle of the invention, substitution, combination, simplifies, and should be
The substitute mode of effect, is included within the scope of the present invention.
Claims (10)
1. a kind of two dimension composite photo-catalyst h-BN/Ti3C2/TiO2, which is characterized in that the catalyst is two-dimentional composite construction,
Disc-shaped h-BN is supported on Ti3C2In nanometer sheet, and Ti3C2Aoxidize obtained TiO2Particle is located at disc-shaped h-BN and Ti3C2It receives
Among rice piece.
2. two dimension composite photo-catalyst h-BN/Ti described in claim 13C2/TiO2Preparation method, which is characterized in that including
Following steps:
(1) by Ti3C2Ultrasound removing mixes with h-BN after freeze-drying, and deionized water is added, and ultrasonic disperse forms dispersion
Then liquid carries out hydro-thermal reaction；
(2) dispersion liquid after reaction is taken out, is filtered, washed and dried to get the two-dimentional composite catalyst h-BN/ is arrived
Ti3C2/TiO2。
3. preparation method according to claim 2, it is characterised in that: Ti in the step (1)3C2With the mass ratio of h-BN
For 1:3 ~ 3:1.
4. preparation method according to claim 2, it is characterised in that: in the step (1), titanium carbide is to pass through etching liquid
Corrode Ti3AlC2It obtains.
5. preparation method according to claim 2, it is characterised in that: dispersion liquid concentration is 0.1 ~ 1 in the step (1)
g/mL。
6. preparation method according to claim 2, it is characterised in that: in the step (1) hydrothermal temperature be 160 ~
200 DEG C, the time be 8 ~ for 24 hours.
7. preparation method according to claim 2, it is characterised in that: in the step (2), drying temperature is 60 ~ 120oC, time are 6 h or more.
8. any one of the claim 1-7 two-dimentional composite photo-catalyst h-BN/Ti3C2/TiO2It is synthesized in photochemical catalytic oxidation xylose
Application in xylonic.
9. application according to claim 8, which is characterized in that by xylose, two-dimentional composite photo-catalyst h-BN/Ti3C2/
TiO2It is mixed with strong base solution, xenon lamp irradiates lower heating stirring and carries out catalysis reaction.
10. application according to claim 8, which is characterized in that strong base concentrations are 0.05 ~ 0.1 mol/L, and reaction temperature is
30~70 oC, reaction time are 0.5 ~ 3 h, and catalyst concn is 1 ~ 5 mg/mL, and xylose concentration is 1 ~ 20 mg/mL.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111116344A (en) * | 2019-12-22 | 2020-05-08 | 上海交通大学 | Method for preparing lactic acid by photocatalytic conversion of monosaccharide biomass |
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| CN112920055A (en) * | 2021-02-01 | 2021-06-08 | 重庆工商大学 | Visible light catalytic one-pot hydrogenation and amidation method for nitroarene and carboxylic acid |
| CN112920055B (en) * | 2021-02-01 | 2022-08-05 | 重庆工商大学 | Visible light catalytic one-pot hydrogenation and amidation method for nitroarene and carboxylic acid |
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